Fuel-oil pump



A. G. LuNDsTROM FUEL OIL PUMP Filed Oct. 26. 1926 nvmvrqa Patented May 8, 1928.

STATES,

This invention relates to fuel oil pumps for internal combustion engines of the solid fuelinjection type.

Fuel oil pumps of the type using solid airless injection have ordinarily heretofore been provided with separate fuel injectlon jection to that arrangement is that each pump has its peculiar characteristics which 1. make it difficult to-maintain the fuel charges A similar to each other at all loads and speeds. This is partly due to the use of individual .l'by-passing or cut-off valves for each pump. 'j? It-is an object of this invention to enable 1 multi-internal combustion, engine to be 1 operated by a plurality of pump plungers,

bined in a unitary structure so as to employ a'single by-pass valve for governing the injection of fuel into such cylinders.

i Other objects and advantages of the struc- ;ture will be in part obvious and in part pointed out hereinafter. F 'In the accompanying drawing forming part of the specification and in which similar reference characters refer to similar parts, there is shown in vertical section, a fuel pump constructed in .accordance'with the practice of the invention.

posed a plurality of cylinders B preferably symmetrlcally arranged with respect to'the :pther. Within each cylinder'B, a pump f plunger G is adapted to reciprocate, being .j. actuated by a cam D mounted on a rotatable F axially disposed in one end of the pump body A. The pump plunger C may be provided with cam following rollers G to re- 1 plied to the cylinders B from a fuel oil'supply chamber H formed in the head of the pump body A and associated with a suitable 5- oil supply pipe J A suction valve K for '-.2' each cylinder, in this instance shown as a 1 The plug L may be screwed into an aperpumps for each engine cylinder; One ob,

' one for each cylinder of the engine and com-' .Referring to the drawing, the pump includes a pump body- A in which are disaxis of the pump body and parallel to each.

'2 shaft E preferably journalled in a bushing.

- duce friction againstth'e cam D.- Oil is sup ball type valve, is mounted in a plug L to control the flow of oil into each cylinder B.

PATENT err-res. 7

nnrnun o. Lnnnsrnom, or rmnn rsnuno, NEW JERSEY, Assmnoa'ro INGERSOLL- Ram) COMPANY, or 'JrmsEY orrx, new JERSEY, A oonronnrron on NEW JERSEY.-

' aunt-01L rumr. Application fled mm; 26, 1926. Serial no. 144,333.

ture O coaxial with the cylinder B and is seated againsta perforated gasket or washer P in a bore Q in the top wall R of the cylinder B.- A smaller bore S forms a passage for the fuel oil into each cylinder B. The

suction stroke of the plungers C may be C. Each discharge chamber U is connected with a particular pipe line X1 associated with the spraynozzl'es of a cy inder of a multi-cylinder internal combustion engine (not shown); Any suitable form of connection may be used, in this instance the pipe Y is flanged as at Z and sealed by means of a gasket. 6 held in place bya. hollow plug 0 screwed into the plug V. The flanged end Z of-the pipe Y provides an abutment for a coil spring d resiliently holding the valve X to its seat.

In operating an engine of the solid injection type, regulation of the speed and power is obtained by by-passing the oil from the fuel pump at the proper instant. In accordanc with this invention, a single bypassvalve is employed to relieve the pressure in thecylinders B. at the instant. of fuel cut off. To this end there is provided iii the pump body A, a common discharge pressure chamber e common to all of the cylinders B. The oil is by-passed from the common pressure chamber e by means of a bypass valve for the chamber e; The bypass valve f may be actuated in any suit-- able manner, as for instance, by means of a lever g actuated in any well known manner, the excursions of the lever 9 being regulated by means of a movable fulcrum h controlled by a governor (not shown).

In this instance the by-pass valve f is I mounted in a plug 7' extending into the pressure chamber e and having suitable passages k for conducting fuel oil from the chamber e to the valve 7 at its seat 0. Preferably, the stem of the valve f is tapered as at p to permit oil to pass along the valve stem p into passages g and thence into a conduit 1" connected with a return pipe 8 leading to the fuel tank (not shown). lEreferably, the plug 7' is formed in three pieces,

the inner end portion t having the assages ity jury, due to constant hammering of the lever g.

Check valves 3 mounted in valve seat plu s z are interposed between the cylinders and the pressure chamber e to prevent direct communication between the cylinders;

Check valves 3/ may be of any suitable form and are held to their seats by means of coil springs 2.

In operation, the shaft E is rotated preferably by connections to the engine crank shaft (not shown) and at suitable speed depending upon the type of cycle of the engine. If the engine is of a two stroke cycle type, the shaft E should rotate at the crankshaft speed; likewise, if the engine is'of the four stroke cycle type the shaft E should be rotated at one half the crank shaft speed. The cam D engaging the plungers C therefore causes a reciprocation of the lungers successively as the shaft rotates. n the suction stroke of the plungrs C oil is introduced intothe cylinders from the fluid supply chamber H past the suction valves K. At the ump stroke of the plungers C fueloil is inJected partly into the common pressure chamber 6 past the check valves y but first into the discharge chamber U, past the check valves X and thence through the pipe lines Y to the injection ndzzles not shown). At the instant of cut off, t e lever g is adapted to depress the by-pass valve f ermitting from that instant the fuel oil isplaced 1n the cylinders B to flow past the check valve y into the common ressure chamber a and the passages k of t e plug fand thence returning through the conduit 1- to the return pipe 8. Upon release of the lever g the sprmg u recedes the. by-pass valve f permitting the plungers C to again inject fuel 011 through the pipes Y to the mjection nozzles.

The, number of cylinders B and pump plungers G correspond to the number of d cylinders of the engine (not shown). In

this instance, only two cylinders B are illus trated bein understood that as many as deinjection internal combustion engine com prising a'pluralit of pump plungers, a discharge pressure 0 amber associated with all of said pump plungers, a by-pass valve adapted to relieve the pressure 1n said chamher at each stroke of each plunger, and means for causing successive reciprocation of said plungers.

3. A fuel pump for a multi-cylinder solid injection internal combustion engine comprising a plurality of cylinders, lungers adapted to reciprocate in said cylin ers, discharge passages'for said cylinders, a common discharge pressure chamber in communication with all of said cylinders, and a by-pass valve in said pressure chamber to relieve the pressure in said cylinders at each stroke of each'plunger. I

4. A fuel pump prisinga plurality of cylinders, v lungers adapted to reciprocate in said cylin ers, discharge passages for said cylinders, a common discharge pressure chamber in communication with all of said cylinders, a by-pass valve in said pressure chamber to relieve the pressure in said cylinders at each stroke of each pliinger and a cam for successively actuating saidplungers.

5. A fuel pump for a multi-cylindersolid injection internal combustion engine comprising a pump body having symmetrically isposed pump cylinders therein, plungers adapted to reciprocate in said cyhnders, a cam adapted to actuate said plun cessively, separate discharge cham ers for each cylinder, a check valve in each of said discharge chambers, said pump body being provided with: a discharige pressure chamber 7 common to said cylin ers, and a by-pass valve to reheve the pressure in said pressure chamber at each stroke of each plunger.

6. A fuel chamberfor amulti-cylinder.

solid injection internal combustion engine COIIIPIISIIIg a pump body'having a plurality of symmetricall disposed pump cylinders,-

to reciprocate in said cylin- Y I plungers adapte ers, scam adapted to. actuate said lungers successwely, separae discharge chem rs for for a multi-cylinder solid 1n ect1on interna combustion engine com-- each cylinder, a check valve in each of said discharge chambers, a suction valve for each cylinder, said 'pump body being provided with a discharge ressure chamber common to all of the cylin ers, check valves controlling the flow of fuel oil from said cylinders to said pressure chamber, and a by-pass valve in said discharge pressure chamber. adapted to relieve the pressure in said pressure chamber at each stroke of each plunger.

In testimony whereof I have signed this specification.

ARTHUR G. LUNDSTROM. 

